PHP/MySQL Search Engine script源码精华教程 -免费技术教程下载中心

<?php

$hostname_logon = "localhost" ;
$database_logon = "databaseName" ;
$username_logon = "databaseUser" ;
$password_logon = "databasePass" ;
//open database connection
$connections = mysql_connect($hostname_logon, $username_logon, $password_logon) or die ( "Unabale to connect to the database" );
//select database
mysql_select_db($database_logon) or die ( "Unable to select database!" );

//specify how many results to display per page
$limit = 10;

// Get the search variable from URL
$var = @$_GET['q'] ;
//trim whitespace from the stored variable
$trimmed = trim($var);
//separate key-phrases into keywords
$trimmed_array = explode(" ",$trimmed);

// check for an empty string and display a message.
if ($trimmed == "") {
$resultmsg = "<p>Search Error</p><p>Please enter a search...</p>" ;
}

// check for a search parameter
if (!isset($var)){
$resultmsg = "<p>Search Error</p><p>We don't seem to have a search parameter! </p>" ;
}
// Build SQL Query for each keyword entered
foreach ($trimmed_array as $trimm){
// EDIT HERE and specify your table and field names for the SQL query
$query = "SELECT * FROM tablename WHERE field1 LIKE \"%$trimm%\" OR field2 LIKE \"%$trimm%\" OR field3 LIKE \"%$trimm%\" ORDER BY field1 DESC" ;
// Execute the query to get number of rows that contain search kewords
$numresults=mysql_query ($query);
$row_num_links_main =mysql_num_rows ($numresults);

// next determine if 's' has been passed to script, if not use 0.
// 's' is a variable that gets set as we navigate the search result pages.
if (empty($s)) {
$s=0;
}

// now let's get results.
$query .= " LIMIT $s,$limit" ;
$numresults = mysql_query ($query) or die ( "Couldn't execute query" );
$row= mysql_fetch_array ($numresults);

//store record id of every item that contains the keyword in the array we need to do this to avoid display of duplicate search result.
do{
$adid_array[] = $row[ 'fieldid' ];
}while( $row= mysql_fetch_array($numresults));
} //end foreach

if($row_num_links_main == 0 && $row_set_num == 0){
$resultmsg = "<p>Search results for:" . $trimmed ."</p><p>Sorry, your search returned zero results</p>" ;
}
//delete duplicate record id's from the array. To do this we will use array_unique function
$tmparr = array_unique($adid_array);
$i=0;
foreach ($tmparr as $v) {
$newarr[$i] = $v;
$i++;
}

// now you can display the results returned. But first we will display the search form on the top of the page
?>

<form action="search.php" method="get" name="search">
<div align="center">
<input name="q" type="text" value=" <?php echo $q; ?> " size="15">
<input name="search" type="submit" value="Search">
</div>
</form>

<?php
// display what the person searched for.
if( isset ($resultmsg)){
echo $resultmsg;
exit();
}else{
echo "Search results for: " . $var;
}

foreach($newarr as $value){
// EDIT HERE and specify your table and field names for the SQL query
$query_value = "SELECT * FROM tablename WHERE fieldid = '$value'";
$num_value=mysql_query ($query_value);
$row_linkcat= mysql_fetch_array ($num_value);
$row_num_links= mysql_num_rows ($num_value);

//now let's make the keywods bold. To do that we will use preg_replace function.
//Replace field
$titlehigh = preg_replace ( "'($var)'si" , "<b>\\1</b>" , $row_linkcat[ 'field1' ] );
$linkhigh = preg_replace ( "'($var)'si" , "<b>\\1</b>" , $row_linkcat[ 'field2' ] );
$linkdesc = preg_replace ( "'($var)'si" , "<b>\\1</b>" , $row_linkcat[ 'field3' ] );

foreach($trimmed_array as $trimm){
if($trimm != 'b' ){
$titlehigh = preg_replace( "'($trimm)'si" , "<b>\\1</b>" , $titlehigh);
$linkhigh = preg_replace( "'($trimm)'si" , "<b>\\1</b>" , $linkhigh);
$linkdesc = preg_replace( "'($trimm)'si" , "<b>\\1</b>" , $linkdesc);
}
//end highlight

?>
<p>
<?php echo $titlehigh; ?><br>
<?php echo $linkhigh; ?><br>
<?php echo $linkhigh; ?>
</p>

<?php
} //end foreach $trimmed_array
if($row_num_links_main > $limit){
// next we need to do the links to other search result pages
if ($s>=1) { // do not display previous link if 's' is '0'
$prevs=($s-$limit);
echo "<div align='left'><a href='$PHP_SELF?s=$prevs&q=$var&catid=$catid'>Previous " .$limit. "</a></div>";
}
// check to see if last page
$slimit =$s+$limit;
if (!($slimit >= $row_num_links_main) && $row_num_links_main!=1) {
// not last page so display next link
$n=$s+$limit;
echo "<div align='right'><a href='$PHP_SELF?s=$n&q=$var&catid=$catid'>Next " .$limit. "</a></div>";
}
}
} //end foreach $newarr
?>

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